EP 1381160 A1 20040114 - Capacitive keyboard with reduced keying ambiguity
Title (en)
Capacitive keyboard with reduced keying ambiguity
Title (de)
Kapazitive Tastatur mit verminderter mehrdeutigkeit bei der Eingabe
Title (fr)
Clavier capacitif avec reduit ambiguité de saisie
Publication
Application
Priority
US 39536802 P 20020712
Abstract (en)
A method for removing keying ambiguity in a keyboard. Using capacitive proximity sensors, the signal strength from each of the keys of a keyboard is repeatedly measured, the signals being responsive to the degree of coupling between each key and a potential user digit. The measured signal strengths are compared with each other to find the strongest one. The key with the strongest signal is then deemed to be the user-selected key. After selection of a key in this way, signals from the other keys are suppressed or ignored for as long as the signal from the selected key remains above a threshold value. <IMAGE>
IPC 1-7
IPC 8 full level
G06F 3/023 (2006.01); G06F 3/044 (2006.01); H03K 17/96 (2006.01)
CPC (source: EP US)
G06F 3/0237 (2013.01 - EP US); G06F 3/0446 (2019.05 - EP US); H03K 17/9622 (2013.01 - EP US)
Citation (search report)
- [XY] US 4954823 A 19900904 - BINSTEAD RONALD P [GB]
- [Y] US 4617554 A 19861014 - KRAUSE CHARLES A [US], et al
- [A] EP 0609021 A2 19940803 - AT & T CORP [US]
- [A] EP 0689122 A1 19951227 - MATSUSHITA ELECTRIC IND CO LTD [JP]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1381160 A1 20040114; EP 1381160 B1 20051012; EP 1381160 B8 20060118; AT E306748 T1 20051015; DE 60301831 D1 20051117; DE 60301831 T2 20060810; US 2004008129 A1 20040115; US 6993607 B2 20060131
DOCDB simple family (application)
EP 03254396 A 20030711; AT 03254396 T 20030711; DE 60301831 T 20030711; US 61760203 A 20030711